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ChemInform Abstract: Modification of MCM-41 by Surface Silylation with Trimethylchlorosilane and Adsorption Study.

✍ Scribed by X. S. ZHAO; G. Q. LU

Publisher
John Wiley and Sons
Year
2010
Weight
30 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

1998 ion exchange, zeolites, molecular sieves, crown ethers, clays ion exchange, zeolites, molecular sieves, crown ethers, clays V 1350

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Modification of MCM-41 by Surface Silylation with Trimethylchlorosilane and Adsorption Study.

-The surface chemistry of siliceous MCM-41 is effectively modified to be more hydrophobic by chemical attachment of organic species (silylation), e.g. with free and geminal silanol groups. Results of H 2 O adsorption measurements show that aluminosilicate MCM-41 materials are more or less hydrophilic, giving a type IV isotherm, whereas siliceous MCM-41 are hydrophobic, exhibiting a type V adsorption isotherm. The fully silylated Si-MCM-41 samples are more hydrophobic, giving a type III adsorption isotherm. Surface chemistry plays an important role in H 2 O adsorption, whereas benzene adsorption is dominated by the pore geometry

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